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1.
研究了温度从15℃升高到50℃时,安徽省某地石英砂矿物的反浮选特性。研究表明在矿浆pH值2-2.5时,温度为45℃,石英表面ζ电位的负值是试验温度范围内的最低值,此时长石的表面ζ电位的负值比在25℃时要大,有利于阳离子捕收剂在长石表面的吸附,从而提高长石与石英的浮选分离效果。 相似文献
2.
《Ceramics International》2016,42(7):8170-8178
The reaction mechanism, the equilibrium composition, the temperature range of stability of formed intermediates as well as the kinetics and thermodynamics of activated state during the formation of monoclinic strontium-aluminum-silicate feldspar stroncian (SrAl2Si2O8) via the ceramic route from the mixture of SrCO3, Al2O3 and SiO2 is described in this work. Strontian does not appear up to the temperature of 1150 °C and is the only stable phase at the temperature ≥1600 °C. Three independent reactions lead to two parallel reaction pathways, i.e. the formation of strontian from single or binary oxides (1) and with Sr-gehlenite as the intermediate (2). Since the reaction rate constants ratio is higher than one (k1/k2>1), the first reaction route is favored according to the Wegscheider principle. The kinetics of chemical reaction of 1.5 order corresponding to the kinetic function F2/3 ((1−α)−1/2−1) was determined as the rate determining the mechanism of formation of strontian. The integral and differential methods show that the process requires average apparent activation energy of 229.3 kJ mol−1. The determined average value of frequency factor is 2.1×105 s−1. 相似文献
3.
矿产资源在选矿过程中产生的大量尾矿,既是资源的浪费,又是环境污染源。因此,开展低尾化乃至无尾化综合利用研究,最大程度提高资源利用率是未来矿产资源开发、利用的必由之路。本文在研究国内某复杂多金属矿综合利用时,通过分析所含矿物的基因属性、赋存状态以及嵌布关系,先后进行了钽铌精矿、方解石精矿、锂精矿、云母精矿、长石精矿、石英精矿共计6个产品的选别回收,实现了除少量泥质、铁屑之外的全产品、无尾化综合利用技术路线,可为以后同类型复杂多金属矿的综合回收提供思路借鉴。 相似文献
4.
Ilaria Adamo Valeria Diella Alessandro Pavese Pietro Vignola Fernando Francescon 《Journal of the European Ceramic Society》2013,33(15-16):3387-3395
The system Na-feldspar (F) and kaolinite (K) was investigated at temperatures of interest in ceramic applications (1200–1280 °C) to study the effects of F/K ratios by weight and crystallinity degree of kaolinite on the final product, micro-structural features and mullite-glass Gibbs energy of formation (ΔGeff). Mullite and glass are the dominant phases; in general, the higher the temperature, the larger the former. An F/K increase promotes the formation of glass and secondary mullite, appearing along with the primary one. ΔGeff was modelled by α(T) × (F/K)2 + β(T) × F/K + γ(T), α, β and γ being linear functions of temperature whose coefficients were determined by fitting the ΔGeff-theoretical to the ΔGeff-obtained from the measured phase compositions. ΔGeff is less affected by temperature than by F/K, whose increase shifts equilibrium towards glass phases. The ΔGeff-curves for ordered and disordered kaolinite intersect one another at F/K ~0.5, a ratio close to that used in industrial practice. 相似文献
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6.
为提高火焰光度法测定长石中钾钠含量的准确度,以钾长石标准物质为参考,在使用FP6410型火焰光度计对长石中钾钠含量测定过程中,对火焰光度计的模拟量、背景酸种类以及共存离子(Fe3+)浓度3个影响因素进行研究。结果表明,火焰光度计模拟量大小对长石钾钠含量测定基本无影响;以HNO3和H2SO4作背景酸时,测定结果与标准物质含量相比,K2O分别偏高10.4%,283.3%,Na2O分别偏高108.7%、387.8%;外加铁试验表明,长石中含Fe2O33.05%时,使用FP6410型火焰光度计测得的K2O含量,偏低9.38%,而对Na2O测定基本没有影响。 相似文献
7.
M. Zawisky F. Hameed J. Springer 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2010,268(15):2446-2450
Improved spatial detector resolution is exploited for engineering and geology, e.g., for the investigation of boron distribution in steel, consolidated aspects of building materials, and grain analysis in feldspar. The strengths and limitations of the upgraded instrument are evaluated in the context of these projects. First promising results have been obtained and will extend the range of applications for the neutron imaging beam-line at the Atomic Institute in Vienna. 相似文献
8.
主要研究金尾矿中影响金矿尾砂代替长石作陶瓷墙地砖原料的主要因素--Fe质。Cl对陶瓷墙地砖生产工艺及产品质量的影响;分析了产生影响的机理,讨论金矿尾矿砂除铁脱Cl的方法及工艺;确定了金尾矿代替长石作陶瓷墙地砖原料的加工工艺及有前的性能要求。 相似文献
9.
10.
《Polymer-Plastics Technology and Engineering》2013,52(5):1323-1344
Abstract Comparison studies on effects of feldspar and silica (Vulcasil C) as a filler in (SMR L grade natural rubber) vulcanizates on curing characteristics, mechanical properties, swelling behavior, thermal analysis, and morphology were examined. The incorporation of both fillers increases the scorch time, t 2, and cure time, t 90, of SMR L vulcanizates. At a similar filler loading, feldspar exhibited longer t 2 and t 90 but lower values of maximum torque, MHR, and torque difference, MHR–ML than did silica-filled SMR L vulcanizates. For mechanical properties, both fillers were found to be effective in enhancing the tensile strength (up to 10 phr), tensile modulus, and hardness of the vulcanizates. However, feldspar-filled SMR L vulcanizates showed lower values of mechanical properties than did silica-filled SMR L vulcanizates. Swelling measurement indicates that swelling percentages of both fillers-filled SMR L vulcanizates decrease with increasing filler loading whereas silica shows a lower swelling percentage than feldspar-filled SMR L vulcanizates. Scanning electron microscopy (SEM) on fracture surface of tensile samples showed poor filler–matrix adhesion for both fillers with increasing filler loading in the vulcanizates. However, feldspar-filled SMR L vulcanizates showed poorer filler–matrix adhesion than did silica-filled SMR L vulcanizates. Thermogravimetric analysis (TGA) results indicate that the feldspar-filled SMR L vulcanizates have higher thermal stability than do silica-filled SMR L vulcanizates. 相似文献